At a glance
| Input | Any files, dragged in together |
|---|---|
| Output | One ZIP |
| Where it runs | Entirely in your browser — no file is uploaded to a server |
| Price | Free, with no account and no sign-up |
| Offline | Works with no connection after the first visit |
Why some files barely shrink
Zip compresses by finding repetition. Text, spreadsheets and uncompressed images have plenty and compress well — often to a third or less. JPEG, MP3, MP4, PNG and anything already compressed have had that repetition removed already, and zipping them saves a percent or two at most.
Which is why a folder of photographs zips to almost exactly its original size. The point there is not compression but getting one file instead of two hundred.
What a zip does not do
It carries no permissions on Windows, does not preserve macOS resource forks, and stores modification times with two-second precision. For a backup, those matter; for sending files to someone, none of them do.
Empty folders are preserved, which is worth knowing when the structure is part of what you are sending.
Frequently asked questions
Why is my zip the same size as the files?
They were already compressed. JPEG, MP3, MP4 and PNG have no redundancy left for zip to find, so it can only bundle them.
Can I password-protect it?
Not here. Zip encryption is weak in its common form, and doing it properly needs a dedicated tool. For anything sensitive, encrypt before zipping.
Is there a size limit?
No upload limit, since nothing is uploaded. Very large archives are limited by your machine’s memory.
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